Valve grinder



Dec. 10, 1929.. J. L. REILLY 1,739,419

VALVE GRINDER Filed Nov. 1927 3 Sheets-Sheet 1 Jam: L .jPezz y 7- Mamas AWW J. L. REILLY VALVE GRINDER Dec. 10, 1929.

Filed Nov. 1927 3 Sheets-Sheet 2 Z adr-s J. L. REILLY Dec. 10, 1929.

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Patented Dec. 10, 1929 UNITED STATES JOHN L. REILLY, or INDIANAPOLIS, INDIANA VALVE GRINDER Application filed November 7, 1927. Serial No. 231,464.

This invention relates to a grinder for internal combustion engine valves.

The principal objects of the invention are to mount all the parts in the simplest form and to provide a construction in which the parts will have fewer and simpler bearing surfaces, all of which can be repaired by the simplest processes and by fewer operations than has been the case heretofore; and to provide a construction in which there will be no sliding parts and yet by which the ad vantages of the ordinary sliding elements are secured to the fullest extent and with a simplification and reduction in the cost of the mechanism. The invention also involves the provision of a self-contained mechanism of a comparatively simple form for this purpose which will take up very little room and be adjusted easily to secure the desired results.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which Fig. 1 is a plan of a valve grinding machine constructed in accordance with this invention and showing it in position for grinding a valve;

Fig. 2 is a longitudinal sectional view on the line 22 of Fig. 1, showing the means for supporting, adjusting and turning the work in side elevation;

Fig. 3 is a sectional view on the line 33 of Fig. 2, showing the work supporting frame and its adjusting means in elevation;

Fig. 4.- is a side view of the motor and its support;

Fig. 5 is a sectional view of the same on the line 55 of Fig. 4, showing the parts above in end elevation, and

Fig. 6 is a sectional view on the line 66 of Fig. 1, showing the valve and grinding wheel in elevation as they appear while in operation.

Valve grinding machines as heretofore conr structed have been unnecessarily complicated in my opinion, because the moving parts were mounted to slide in ways. This involves the machining of the ways and the arts that slide in them, and the provision o compara -59 atively complicated mechanism. for sliding the parts. Also in case of repairs, it has been an expensive matter to realine the ways and grind them, or otherwise finish their surfaces;

and also requires expenditure of much time in fitting the parts together after, they are reground. The operation also is not as simple as is possible with m machine.

I prefer to'mount thewho e'machine on a base 10. On this base are provided lugs 11 having pivot pins 12 by which the work holder frame is pivoted to the base. This frame consists of two end pieces '13'connected together by rods 14: which are firmly fixed to the end pieces 13. These parts are rigidly and firmly secured together and the rods 14 also support a center piece 15 which is also pivoted to one of the lugs 11. I have shown one of the end pieces 13 as not being pivoted, as it is essentialonly that two of these three pieces be pivoted to the base.

One of the end pieces is provided with a bearing for the main shaft which has a chuck 16 for holding the valve stem 17. The other end piece has an adjusting screw 18 with a tail centerpoint entering a center on the valve head 19. The member 15 of the frame is per- 'forated and through it passes a rod 20, the end of which is loosely held in the lug 21 on the frame. The rod has a head on the rear side of this lug and is provided with a coiled spring 22 between the lug and the member 15. This spring forces the whole frame back on its pivots and a screw-threaded hand wheel 23 on the rod 20 is used to force it forward. This furnishes the simplest way of mounting this frame and the simplest possible way of adjusting it back and forth to bring the work into proper position With-respect to the grind ing means and holding the adjustment.

One of the end pieces 13 of the frame is 99 also provided with a bearing for another shaft 25. The two shafts mentioned are provided with pulleys 26 and 27 connected by a belt so that the work is rotated from the shaft 25. This shaft is secured to the end of a fleX- ible shaft 28 which is secured to another shaft 29 mounted in a pivoted frame 30.

This frame is pivoted on a horizontal axis "31 to a standard 32 which is fixed, as by a screi v33, to the base 10. This shaft 29 is 199 mounted to rotate freely in its bearings in the pivoted frame 30, and is provided with a pulley 35. It is operated by a belt 36 from the shaft of the motor 37.

On the motor shaft is located a grinding wheel 38. The motor is secured to the tilting frame 30 by a bifurcated or U-shaped bracket 39, which projects on opposite sides of a projection on the frame 30 and is secured by abolt 4:0. This motor can be tilted a little to tighten the belt and then secured firmly in position on the tilting frame 30. It swings with hfijf course, about the pivot 31.

The shaft 29 extends through the frame 30 and is provided with a head 41 at the opposite end which has an eccentric -pin42. This pin is pivotally connected with a link 18 which is pivoted on a horizontal pin 4.4: in the standard 32.

It will be seen that as the motor operates,

the shaft 29 is rotated and the head 41 must rotate with it, and as the pivot 42 rotates around with its head and is always at the same distance from the pin 44:, the frame 30 is forced to oscillate on the pivot stud 3i as a center. This is indicated in dotted lines in Fig. 4. It takes with it the motor and the grinding wheel. Consequently the grinding wheel has its traverse across the conical face of the valve 19 as shown in Fig. 6. This tilting motion is very much simpler than the ordinary reciprocating motion, and all the parts connected with it for securing the motion are also simpler, the accuracy of grinding a for connecting the motor to said frame to swing on a horizontal axis thereon for the purpose of adjusting the motor.

In testimony whereof I have hereunto affixed my signature.

JOHN L. REILLY.

is in no wa reduced, and the danger of any change in t o position of the grinding wheel is not increased.

It will be seen that this construction, in which all the movements are secured by the swinging of the parts on horizontal pivots,

results in reducing the construction to its simplest terms, thus reducing the cost of manufacture in assembling and. also the cost of repairs.

Althou h I have illustrated and described only one orm of the invention, I am. aware of the fact that changes can be made therein by any person skilled in the art without departing from the scope, of the invention as expressed in the claims.

Therefore, I do not wish to be limited to the exact form shown, but what I do claim is 1. In a valve grinder, the combination of a a standard having a recess therein, with a frame mounted in said recess and adapted to swing on a horizontal pivot carried by the standard, a shaft extending through said frame, a motor carried by the frame,a grinding wheel and a pulley on the shaft of the motor, a pulle 7 adapted to be .c riven by the motor shaft pulley, a head on the first named shaft having an eccentric stud thereon, and a link pivoted to said stud and to the standard at a' point he'- on the first named shaft ios 

